linux-kernel - Re: [v3] arm64: dts: sc7180: add nodes for idp display

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Message-ID: <5c2265e82af8f755d649c0c36a462f19@codeaurora.org>
Date:   Mon, 29 Jun 2020 19:20:09 +0530
From:   harigovi@...eaurora.org
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        seanpaul@...omium.org, hoegsberg@...omium.org,
        kalyan_t@...eaurora.org, nganji@...eaurora.org
Subject: Re: [v3] arm64: dts: sc7180: add nodes for idp display

On 2020-06-25 06:37, Stephen Boyd wrote:
> Quoting Harigovindan P (2020-02-17 00:58:42)
>> diff --git a/arch/arm64/boot/dts/qcom/sc7180-idp.dts 
>> b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> index 388f50ad4fde..349db8fe78a5 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> +++ b/arch/arm64/boot/dts/qcom/sc7180-idp.dts
>> @@ -232,6 +233,57 @@ vreg_bob: bob {
>>         };
>>  };
>> 
>> +&dsi0 {
>> +       status = "okay";
>> +
>> +       vdda-supply = <&vreg_l3c_1p2>;
>> +
>> +       panel@0 {
>> +               compatible = "visionox,rm69299-1080p-display";
>> +               reg = <0>;
>> +
>> +               vdda-supply = <&vreg_l8c_1p8>;
>> +               vdd3p3-supply = <&vreg_l18a_2p8>;
>> +
>> +               pinctrl-names = "default";
>> +               pinctrl-0 = <&disp_pins>;
>> +
>> +               reset-gpios = <&pm6150l_gpio 3 GPIO_ACTIVE_HIGH>;
>> +
>> +               ports {
>> +                       #address-cells = <1>;
>> +                       #size-cells = <0>;
>> +                       port@0 {
>> +                               reg = <0>;
>> +                               panel0_in: endpoint {
>> +                                       remote-endpoint = <&dsi0_out>;
>> +                               };
>> +                       };
>> +               };
>> +       };
>> +
>> +       ports {
>> +               port@1 {
>> +                       endpoint {
>> +                               remote-endpoint = <&panel0_in>;
>> +                               data-lanes = <0 1 2 3>;
> 
> Is this property needed? If it's the default assumption it would be 
> nice
> to omit it so that we don't have to think about it.
> This property is needed during panel probe. If this is not mentioned 
> here,
mipi_dsi_attach() will fail during panel probe. In dsi_host.c, 
dsi_host_attach()
fails since dsi lanes are greater than msm_host lanes. msm_host lanes 
are updated
as part of dsi_host_parse_dt. If we dont provide data-lanes in dt, it'll 
have default
value and fail in dsi_host_attach().
>> +                       };
>> +               };
>> +       };
>> +};
>> +
>> +&dsi_phy {
>> +       status = "okay";
>> +};
>> +
>> +&mdp {
>> +       status = "okay";
>> +};
>> +
>> +&mdss {
>> +       status = "okay";
>> +};
>> +
>>  &qspi {
>>         status = "okay";
>>         pinctrl-names = "default";
>> @@ -289,6 +341,17 @@ &usb_1_qmpphy {
>> 
>>  /* PINCTRL - additions to nodes defined in sc7180.dtsi */
>> 
>> +&pm6150l_gpio {
>> +       disp_pins: disp-pins {
> 
> Curious how this works. It looks like PMIC GPIOS are expecting the node
> to look like:
> 
> 	disp_pins: disp-pins {
> 		pinconf {
> 			pins = "gpio3";
> 			function = PMIC_GPIO_FUNC_FUNC1;
> 			qcom,drive-strength = <PMIC_GPIO_STRENGTH_MED>;
> 			power-source = <PM6150_GPIO_VPH>;
> 			bias-disable;
> 			output-low;
> 		};
> 
> but this doesn't use the macros or the subnode for pinconf. Why? Also,
> the PM6150_GPIO_VPH macro doesn't exist.
We are discussing with PMIC team to have that macro in the header file.
Will add other macros as part of next version.
> 
>> +               pins = "gpio3";
>> +               function = "func1";
>> +               qcom,drive-strength = <2>;
>> +               power-source = <0>;
>> +               bias-disable;
>> +               output-low;
>> +       };
>> +};
>> +